Glossary Term:


multiple myeloma



a type of cancer that starts in the plasma cells. Normal plasma cells are found in the bone marrow and are an important part of the body’s immune system. When plasma cells grow out of control, they can form a tumor, usually in the bone marrow. This type of tumor is called a myeloma, and if there are many tumors the cancer is called multiple myeloma. If there is only one tumor, it is called solitary plasmacytoma. See also bone marrow, immune system.